A dataset provided by the European Space Agency

Name: Determining the Nature of the Extreme Off-States in ULX Pulsars with NGC5907 ULX
Published: 2022-07-15T00:00:00Z
License: https://creativecommons.org/licenses/by-nc/3.0/igo

Proposal ID	088422
Title	Determining the Nature of the Extreme Off-States in ULX Pulsars with NGC5907 ULX
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0884220201 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0884220301 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0884220401
DOI	https://doi.org/10.57780/esa-48o6130
Principal Investigator, PI	Dr Dominic Walton
Abstract	Following a series of remarkable discoveries, we now know that some of the mostluminous ULXs are actually powered by highly super-Eddington pulsars (i.e.neutron stars), making them the most extreme accretors known. A number of theknown ULX pulsars exhibit unusual off-states in which their X-ray flux dropsby ~2 orders of magnitude (or more). These off-states are fairly rare, butrecent monitoring with Swift shows that NGC5907 ULX1, the most extreme of theULX pulsars with L(X,peak)~1e41 erg/s, is now entering one. Here we proposethree 60ks observations of NGC5907 ULX1 (180ks in total) designed to continueour efforts to determine the nature of these events. This is of criticalimportance, as these off-states may offer a means to determine the B-fields of these systems.
Publications	Probing the nature of the low state in the extreme ultraluminous X-ray pulsar NGC 5907 ULX1 \|Fu00fcrst F. Walton D. J. et al. \| A&A \| 672-140 \| 2023 \| 2023A&A...672A.140F \| http://ui.adsabs.harvard.edu/#abs/2023A&A...672A.140F The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII O VIII and Fe L-shell Transitions \|Pan Zeyang Qu Zhijie et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P Search for Young Stellar Objects within 4XMM-DR13 Using CatBoost and SPE \|Ma Xiangyao Zhang Yanxia et al. \| AJ \| 168-210 \| 2024 \| 2024AJ....168..210M \| http://ui.adsabs.harvard.edu/#abs/2024AJ....168..210M
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2021-02-20T01:32:22Z/2021-03-05T13:58:37Z
Version	21.51_20241115_1113
Mission Description	The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2022-07-15T00:00:00Z
Last Update	2026-06-19
Keywords	"ulx pulsars exhibit", "actually powered", "ngc5907 ulx1", "ulx pulsars", "super eddington pulsars", "total designed", "NGC5907", "neutron stars", "ngc5907 ulx1 180", "xray flux drops", "1e41 erg", "ngc5907 ulx", "fairly rare", "luminous ulxs"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Dominic Walton, 2022, 'Determining the Nature of the Extreme Off-States in ULX Pulsars with NGC5907 ULX', 21.51_20241115_1113, European Space Agency, https://doi.org/10.57780/esa-48o6130
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.